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UN R30: Proposal for Supplement 27 to the 02 series of amendments
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Reference Number: GRBP/2025/9
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Proposal to: - Update reference to ISO 4000-1:2024 (published in March 2024)
- Clarify the structure indication within the tyre size designation for run flat or self-supporting tyres suitable for speeds in excess of 240 km/h (inscription “ZRF”)
- Clarify the nominal rim diameter.
- Amend the definition of principal grooves by eliminating the circular reference between this definition and the position of tread wear indicators.
- Introduce definition of tread depth (used in the requirements for special use and professional off-road tyres)
- Clarify the calculation of tyre section width
- Claify the Dmax requirement for snow tyres.
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Submitted by: ETRTO
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Meeting Sessions: 81st GRBP session (18-21
Feb 2025)
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Document date: 04 Dec 24
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Document status: Superseded
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Relevant to: UN Regulation No. 30 | Pneumatic Tires
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